sector

noun

1. A section.
2. In the schedule for an aircraft and its crew, the period starting with preparation of the plane before loading at one airport and ending with deplaning at the next.
3. An area designated by boundaries within which a unit operates, and for which it is responsible.
4. One of the subdivisions of a coastal frontier.
5. a fictional region of space designated for navigational or governance purposes.
6. A community or subculture within the wider intermicronational community.
7. Part of a circle, extending to the center; circular sector.
8. A portion of a sphere or ball defined by a conical boundary with apex at the center of the sphere.
9. A fixed-sized unit (traditionally 512 bytes) of sequential data stored on a track of a digital medium.
10. An instrument consisting of two rulers of equal length joined by a hinge.
11. A field of economic activity.
12. A toothed gear whose face is the arc of a circle.
13. A fixed, continuous section of the track, such that sectors do not overlap but all sectors make up the whole track.
14. An area of a crag, consisting of various routes